@article{article_471219, title={EVALUATION OF 2 NICKEL-TITANIUM INSTRUMENT SYSTEMS IN SHAPING ROOT CANALS}, journal={Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi}, volume={29}, pages={400–406}, year={2019}, DOI={10.17567/ataunidfd.471219}, author={Yaşar, Şenay and Erşahan, Şeyda and Aydın, Cumhur}, keywords={Twisted File,RaCe,Curved root canals,Canal transportation,Centering ability}, abstract={<font face="Times New Roman" size="3"> </font> <p style="margin:0cm 0cm 0pt;text-align:justify;line-height:150%;text-indent:35.4pt;"> <b> <span lang="en-us" style="line-height:150%;font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">Evaluation of 2 Nickel-Titanium Instrument Systems in
Shaping Root Canals </span> </b> </p> <font face="Times New Roman" size="3"> </font> <p style="margin:0cm 0cm 0pt;line-height:normal;"> <b> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">Abstract </span> </b> </p> <font face="Times New Roman" size="3"> </font> <p style="margin:0cm 0cm 0pt;line-height:normal;"> <u> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">Objective: </span> </u> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us"> To evaluate root canal enlargement following mechanical shaping using 2
nickel titanium rotary systems in simulated curved canals. </span> </p> <font face="Times New Roman" size="3"> </font> <p style="margin:0cm 0cm 0pt;line-height:normal;"> <u> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">Material and Method </span> </u> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">: <b> </b>Thirty simulated canals in
resin blocks were divided into two experimental groups, each comprising 15
resin blocks, and prepared with Twisted files (TF) </span> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">and RaCe </span> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">rotary files using crown-down technique. Preoperative
and postoperative photographs, taken using a digital camera, were superimposed
and aberrations were recorded. The amount of resin removed was measured at 11
different points, beginning at the apical terminus of the canal. Instrument
failure, outer and inner width measurements, transportation rate, and centering
ability were recorded on each central canal path and differences between groups
were statistically analyzed using Student’s t test. </span> </p> <font face="Times New Roman" size="3"> </font> <p style="margin:0cm 0cm 0pt;line-height:normal;"> <u> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">Results: </span> </u> <b> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us"> </span> </b> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">No instrument
fracture occurred during preparation. RaCe instruments removed more material
from the outer canal walls in the apical section (p < 0.01) and from the
inner canal walls in the middle section (p < 0.01) of the canals compared to
TF. However, canals prepared with TF instruments resulted in less
transportation (p < 0.05) in the middle section. No significant differences
were found between the two groups in terms of centering ability in apical,
middle, or coronal sections. <span>  </span>(p >
0.05). </span> </p> <font face="Times New Roman" size="3"> </font> <p style="margin:0cm 0cm 0pt;line-height:normal;"> <u> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">Conclusions: </span> </u> <b> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us"> </span> </b> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">RaCe instruments
removed more resin from the outside of the apical curvature and from the inner side
of the coronal curvature compared to TF. In addition, mean transportation
amount was significantly high for RaCe in middle section (i.e., coronal
curvature). Regarding canal centering ability, however, both instruments
retained original canal geometry and performed similarly. </span> </p> <font face="Times New Roman" size="3"> </font> <p style="margin:0cm 0cm 0pt;line-height:normal;"> <u> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">Key words: </span> </u> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us"> </span> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">Twisted File, RaCe, Curved
root canals, </span> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">Canal transportation, Centering ability, Ni-Ti rotary
systems </span> </p> <font face="Times New Roman" size="3"> </font> <p style="margin:0cm 0cm 0pt;line-height:normal;"> <span lang="en-us" style="font-family:’Times New Roman’, serif;font-size:12pt;" xml:lang="en-us">  </span> </p> <font face="Times New Roman" size="3"> </font> <p style="margin:0cm 0cm 0pt;line-height:normal;"> <span lang="en-us" style="font-family:’Times New Ro}, number={3}, publisher={Ataturk University}